[DigitalJack]

My wife is like that, takes a long time to fall asleep even when she is tired.

It's rare for me to take long to fall asleep. I can't say for sure how long it is, but I wouldn't be surprised if it was 10 minutes or less.

My problem with naps is that once I'm down, it's 3 hours. I used to be able to take 20 minute naps, but not anymore. If I take a nap, it's just about guaranteed to be 3 hours on the dot.

[virmundi]

You might want to try an old Edison trick. Hold a heavy pen in your hand. Place a hard object below it like a plate. Try to fall asleep. Just when you start to transition to deep sleep (the kind that takes 3 hours), your muscles will relax. Then pen will drop, causing the object to ring out. You'll be startled awake. Now you've got a nap and you've got a shot of adrenaline.