At least in my case, there is such a thing as going to bed when you are too tire...

Psyonic on Feb 5, 2011 | parent | context | favorite | on: Sleep hacks: How to Become an Early Riser

At least in my case, there is such a thing as going to bed when you are too tired. Some days if I miss my sleep window, I get "too tired to sleep." That probably doesn't make much sense as described, but I know at least some people can relate.