I'm usually a just get on with it person but this is rediculous.
Long term problem that's harming working and social life.
It basically like people have said its an anxiety problem. The un-natural pressure to have sleep. Exhausted...but the core of the brain just isn't exhausted enough.
Ah well people have much worse problems in this world
Often overlooked but also try breathing exercises. Not tried it myself but who knows
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http://www.coreperformance.com/daily/one-small-change/breathe-yourself-to-sleep.html