Looking ahead, after the Sleep Debt is paid off, it must be determined if you are an Advanced Sleep Phase, Delayed Sleep Phase, or Normal ("lark", "owl" or... IDK what they call "normal"-- I guess "normal"). Because of your job, it would be advantageous to turn you into a "lark" (given the above comment, you're probably "normal").Tom W wrote:Yes I do need an alarm clock (and usually an elbow from the wife) in order to wake up. I often wake with that hangover type fog/headache even though I don't drink.
Using the aforementioned Two-Process Sleep Model (where only Process S was presented to isolate Nap Effect), you could be fighting Circadian Rhythm (Process C in the model):

Red box represents your general sleep area, blue box bedtime (inconsistency = bad. Follow all Sleep Hygiene Rules) and you are rising before you're ready (which should be the intersection of Process S and Process C).