With as bad a case of sleep apnea as I have and thinking i slept soundly, I would actually fall asleep standing at the sink doing dishes. It was terrible. Once I took the sleep study test and found out the problem, I got a CPAP machine and was able to actually sleep spoundly and never fell asleep agsin standing up, geesh!

Sometimes I do have insomnia, I think we all might from time to time, and everything I've read says: If you don't fall asleep in the first half hour, get up, walk around, have some warm liquid (not caffeine) read awhile and then try again.
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http://charleen-micheles.blogspot.com/