Try taking ZMA supplement before bed.... Makes you sleep well
Stay up for 24 hours and do a hard reset of your body clock at whatever time you deem proper.
Magnesium, Zinc & Vitamin B6? Might as well just take a normal (and much cheaper) multivitamin.
Maybe there is some sort of loud noise which wakes you at this time?
Yeah the OP should definately gag their kidnapped sex slave prisoners more tightly, its probably their blood curdeling screams for help that are waking him.
thanks for all the tips. i really think its just a case of resetting my body clock again. Maybe this weekend, i'll go on a bit of a bender and hit the whiskey ! I had a cup of hot cocoa last night, didn't help, actually just made me wake up for a whizz at 2am.. and then like frickin clockwork, up at 4am again.. could have saved myself the 300cals there by not bothering.