When you sleep, your brain cycles through different stages, each lasting 90 minutes.
You will feel most refreshed when you awake at the end of a 90-minute sleep cycle because you will be closest to your normal waking state. So, starting from when you want to wake up, count back in 90-minute intervals to work out when you should fall asleep. Or let sleepyti.me do it for you. For example, if you want to get up at 7am, try falling asleep at either 11.30pm or 10pm. Nightynight and off to dreamland you go! zzzZZZ