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It’s actually pretty normal to wake up during the night, anyway. In The Canterbury Tales, one of the oldest manuscripts in English culture, they describe “second sleep.” There’s some evidence that we used to go to bed when the sun went down, then wake up for a little bit at night—putter around, make sure we’re not getting eaten by a lion—and then go back to sleep. So it’s pretty normal to like wake up in the middle of the night and use the bathroom or whatever.
REM sleep occurs after the fourth stage of NREM sleep, with the first stage occurring about 90 minutes after you first fall asleep. The first period of REM lasts around ten minutes, and each stage lengthens until the final stage, which may last as long as an hour. Your brain activity is heightened during REM sleep, and you experience intense dreaming plus periods of muscle paralysis. As you age, you spend less time in REM sleep; adults spend about 20% of their sleep in REM, while infants spend about 50% of sleep in REM.
Use a blue light filter on your device. The blue light emitted by smartphones and tablets can be a powerful sleep disruptor. It suppresses your body’s production of melatonin and throws your circadian rhythm off, making it harder to fall and stay asleep. Luckily, many smartphones these days have a “night shift” feature that adjusts the screen from cool (blue) to warm (yellow) light, which is less likely to keep you up past your bedtime. Likewise, there are apps you can run on your laptop or tablet that reduce blue light. Some popular ones are f.lux and Twilight.