I Should Be in Bed

I routinely get into odd sleep cycles. Some nights, I'll climb into bed before 10pm. I usually wind up waking up between 3 & 4am when I do, but I can usually get back to sleep with little difficulty. Other times, I'll do what I've done tonight—stay up way too late. I've been drowsy for more than an hour, but I just haven't ascended the staircase to get to my bed. I'll be pretty tired in the morning.