You have to do something when you're lying in bed. So you play with your mind.

When you're through with your cat, you can't throw it in the trash.

Usually I commit to something in my head and then I start drawing.

How bout we start / with a salad, a fresh bed of lettuce with croutons / Later we can play a game of chess on the futon.

My mind is not a bed to be made and re-made.

Or read a book or listen to a CD that feeds your mind with positive thoughts before going to bed.