I'm tired but can't sleep but analyze: do I have sufficient sleep pressure? Map the pressure factors: time awake, activity level, previous night's sleep. Calculate: have I been awake long enough to build adequate pressure? Show me the pressure threshold: this much time awake = sufficient pressure. Give me the guideline: don't try to sleep until this pressure builds. Include: whether I'm trying to sleep without enough pressure, how to build it, and optimal wake duration.