Has someone been spending too much personal time in the shower?
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Actually, you could've slept on it wrong but usually the blood circulation returns a little faster than what you've described. If that happens in the future, keep you a frozen bag of corn from the grocery store in your freezer. Hold your hand under warm water for 3-5 minutes...then put the frozen back of corn on your hand for 3-5 mintues. That should shock your system back into circulation. (Yes, you can use ice or one of those cold packs....but the medium size corn bags go over your hand nice.) I used to have problems with one foot doing that....and a Navy medic told me about the corn thing (that's what they do on ships) and it solved the problem.
IF it persists though....see a doctor. This can also be related to the onset of diabetes.