3 a.m.

The next time you wake up at 3 a.m. (or whatever time), give yourself 15 to 20 minutes to doze back into dreamland. It’s OK.

If you’re awake longer than that, it’s best to get out of bed, says Dr. Kane.

“Our brains are highly associative,” she says. “That means if we stay in bed for a long time when not sleeping, our brains can associate the bed with wakeful activities like worrying and planning, instead of sleep. Getting out of bed breaks that association.”