Why Do I Fall Asleep on the Sofa but Am Wide Awake When I Get to Bed?

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After a long day, you flop onto the sofa and find yourself dozing off while watching TV. The room is nice and warm, the sofa is comfortable, and the background noise of the TV lulls you to sleep.

Then a loved one nudges you awake and reminds you to go sleep—in bed. But when you get there, you find to your frustration that you’re wide awake.