One of the problems with getting over a cold is that you find yourself getting caught up on your sleep. That’s not a bad thing in and of itself; if I’d been getting a bit more sleep, I probably wouldn’t have got sick in the first place.
But after spending two days resting, recovering, and turning off the alarm clock; I find myself unable to go to sleep at bedtime.
And if you don’t get enough sleep, you might get sick!