Glycine (also known as 2-Aminoacetic Acid) is an amino acid and a neurotransmitter. The body produces glycine on its own, synthesized from other natural biochemicals. We also consume glycine through food. This amino acid is found in high-protein foods including meat, fish, eggs, dairy and legumes. A daily diet typically includes about 2 grams of glycine.
A dark, cool bedroom environment helps promote restful sleep. Program the thermostat so the bedroom’s temperature is between 60 and 75 degrees Fahrenheit (experiment to find what works best for you), and use heavy curtains, blackout shades, or an eye mask to block lights. Also be sure to charge phones and laptops outside the bedroom—even this tiny bit of light can disrupt sleep. If you live in a studio or can’t get away from blue lights for any reason, consider making a (very small) investment in blue light blocking glasses.
Warming your body up with a hot shower an hour before bed and then stepping into cooler air will cause your body temperature to drop more precipitously. Studies show that this rapid temperature decrease slows your metabolism faster and prepares your body for sleep. “Showers can also be very relaxing, so that helps, too,” says Meltzer. If you shower every night around the same time, making it part of a consistent bedtime routine, you’ll see the most sleep value from it, she adds. “Then your body has an expectation of what’s coming next.”
According to the National Sleep Foundation, the optimal room temperature for sleep is between 60 to 67 degrees. In one study, University of Pittsburgh researchers found that when insomniacs wore a special cap designed to lower the temperature of the brain, they fell asleep about as quickly, and slept for about as long, as other study participants without sleep issues. Why this works: The cooling cap helped reduce brain metabolic activity, setting in motion a normal sleep cycle. But you don't need a special device to get better sleep. Keeping your bedroom cool and wearing breathable clothing (or even nothing at all!) can help welcome the sandman.
Even without considering genetics and age, the National Sleep Foundation's 2008 Sleep in America poll found that many adults are apparently not meeting their sleep needs, sleeping an average of only 6 hours and 40 minutes during the week, and about 7.5 hours on the weekends.2 How can you tell if your sleep is adequate and meets your needs? Sleep scientists and physicians have a variety of methods to help determine if you are getting enough sleep.
Whole grain crackers. It’s not just a coincidence that you immediately want to take a nap after chowing down on a carb-heavy meal. Carbs cause your body’s blood sugar levels to spike, which appears to play a role in regulating your body’s sleep-wake clock, suggests a recent Japanese study. Still, you’ll probably get a stomachache and end up tossing and turning all night—by devouring a gigantic bowl of pasta. So pick a lighter option, like a handful whole grain crackers.
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Studies have shown that higher magnesium levels can help induce a deeper sleep, and as I noted, this is especially true when taken together with calcium for better absorption. Research from the Biochemistry and Neurophysiology Unit at the University of Geneva’s Department of Psychiatry indicate that higher levels of magnesium actually helped provide better, more consistent sleep since magnesium is a calming nutrient. In addition to the goat’s milk kefir, foods like spinach, pumpkin seeds and even dark chocolate can help since they’re loaded with magnesium. (5)
If you wake up in the night and can’t get back to sleep within 15 minutes or so, get out of bed and do an activity that requires your hands and your head, like a jigsaw puzzle or a coloring book, says Richard Wiseman, professor for the Public Understanding of Psychology at the University if Hertfordshire and author of Night School: Wake up to the power of sleep. Stay away from the TV and digital screens, whose blue light has been proven to suppress melatonin, a sleep-inducing hormone. “The key is to avoid associating your bed with being awake,” Wiseman says in his 59 Seconds video.
Sleep medications, which are most useful for short-term sleeplessness, do require some caution, because they can result in hangovers the next day, or, even worse, lead you to eat, amble about, and even drive while asleep, with no memory of having eaten, ambled about, or driven. The FDA suggests that if you take Ambien, in particular, and at certain dosages, you shouldn’t drive the next day, or take part in other activities that necessitate your being completely awake, because the drug can remain in your system at levels that may affect your functioning.
When we can't sleep, we become more focused on it. Panicked by our lack of shut-eye, we make constant changes to improve the situation - whether that's going to bed earlier, having longer lie-ins, or watching TV in bed. Consequently, we spend less time actually sleeping in the bedroom. The result? The connection between bed and sleep becomes weak, and we effectively un-learn how to sleep.
Some sleep researchers believe that it might be normal to be awake some during the night. (The fact that you sleep straight through the night without budging may again be a sign of inadequate time spent sleeping and increased sleep pressure.) This phenomenon of being awake at night is called "quiet wakefulness" and is often observed when the sleep habits of non-Western cultures are studied. When people sleep in a group in close quarters, there is more time spent awake during the night. This makes sleep a more fluid concept. Time may be spent chatting, eating a snack or engaging others around you. In history, fragmented sleep with periods of wakefulness in the middle of the night was common, reflected in the midnight adventures seen in the plays of Shakespeare, for example.
There are several different types of prescription sleeping pills, classified as sedative hypnotics. In general, these medications act by working on receptors in the brain to slow down the nervous system. Some medications are used more for inducing sleep, while others are used for staying asleep. Some last longer than others in your system (a longer half-life), and some have a higher risk of becoming habit forming.
In other words, daylight helps your body’s natural clock—which is dictated by the 24-hour cycle of day and night—know when to feel awake and when to feel tired. When your hypothalamus—the gland responsible for regulating sleep and energy levels—senses a change in light, it tells your body to ramp up or ramp down its production of the sleep hormone melatonin. During the day, you feel energized and alert because you don’t produce much melatonin. At night, you produce more, so you feel sleepy.
During deep sleep, you get these long-burst brainwaves that are called delta waves, but during REM, your brainwaves are actually functioning very similarly to waking life. Your body is also paralyzed during REM—it’s a very noticeable physiological difference. You also lose thermo-regulation, meaning if it’s hot in your environment, your body gets hot, kind of like you’re a chameleon.
Block out unwanted noises. Noise can impact your ability to get to sleep as well as your overall sleep quality. Try listening to a radio program or podcast that's not too engaging to help block out noise distractions such as traffic, as well as worrisome thoughts. Listen to something that is soft-spoken instead of loud, and something you enjoy but not so much that you will stay up just to listen to it. Recommended podcasts include: 
Valerian research is more contradictory than that pertaining to melatonin. One valerian study found no benefit to taking the herb at the 14-day mark but discovered that it “greatly improved sleep” after 28 days. Dr. Goldstein confirmed this, noting that, while valerian will work for some “super sensitive” people the first time they take it, for others it may need to build up in their system for weeks before they start to notice any changes (though she notes that the same has been said about melatonin).
Science says, we’re supposed to get sleepy when the sun sets, but since we spend most of our nights indoors basking in the glow of our cell phones and tablets, our brains still think it’s daytime and refuse to shut down. So, here’s what you do: Put the gadgets away and watch the sunset. It being winter and all, that can be difficult. Philips’ Wake-Up Light ($180 at Amazon) offers the ability to fake it. Simply, set it to sunset simulation mode; it will gradually decrease light and sound (on your timeline) to help prepare your body for rest.
Sleep needs and patterns of sleep and wakefulness are not the same for everyone. The first step in determining your need for sleep is through self-evaluation. Ask yourself: "How tired do I feel during the daytime? When do I feel most alert? When does fatigue set in?" Even moments of sleepiness that you may think of as routine, for instance, falling asleep on the subway on the way to work, or during a lecture, are likely a sign that you are not getting enough sleep.
But remember: It's important to talk with your doctors about consistent sleep problems. You should also let them know if you're taking any type of sleep aid, natural or otherwise, to ensure there isn't a potential risk with existing health conditions or other medications you're taking, says clinical sleep educator Terry Cralle, RN. "Like all drugs, natural sleep remedies can have side effects and risks. I think it's good to get information about them and then discuss it with a healthcare provider."
Try “belly breathing.” Controlled, deep breathing is simply a way to direct your mind away from thoughts that might keep you awake. If you find your mind racing as you lie down to go to sleep, place a hand on your belly and breathe in deeply through your nose — so deeply that can feel the air filling your abdomen. Hold it for a couple of seconds, and then breathe out through your mouth. Breathe mindfully like this for a few minutes, just trying to focus your attention on the rising and falling of your belly as you inhale and exhale. If your mind starts to wander, just bring it back to your breathing. The more often you practice this relaxation technique, the easier and more effective it will be.