As the days get shorter, our mornings lose that crucial light cue, so waking up gets harder, reports Popular Science.

Summer or winter, you should aim to go to bed at about the same time every evening and wake up at about the same time every morning.

“One of the most valuable actions that we can do to promote maintaining healthy sleep hygiene is to keep a regular schedule,” Kline says. This isn’t the sexiest advice, but it is very effective.