Your diet, the temperature, and a busy social calendar may be to blame, reports NBC.

“Longer days certainly make it hard to get to bed on time,” says psychiatrist and sleep medicine specialist Dr. Alex Dimitriu. “With a sunset time of 8 [p.m.], it’s easy to be outside later (enjoying the cooler evening), then come home and start the ‘regular’ evening routine. But now everything may be happening two to three hours later than in the winter months, so it’s easy to get to bed too late.”