HTC Desire :: Battery Looses Charge In Half An Hour Early Morning

Had the phone for around 10 days now and thankfully I am starting to get more and more use out of it, especially after tweaking some settings and what not, and over the past 2 days I am closing in on getting 24 hours from one charge with what I consider fairly heavy use (well heavier than what I used my old Pixon and that needed charged daily). The one thing that is bugging me though is this, I put the phone on charge before I go to bed, I wake up and it is around 90% (give or take a few %). Now I realize that the phones doesn't trickle charge but when I check the drain on juiceplotter, at the same time every morning, it drains.

5am-5:30am it goes down 10% or so, with out fail. It loses the charge in around about half an hour, meaning when I get up in the morning I need to pop it back on charge for a bit to get it back up to 100%. Not a huge hassle but it is irking me somewhat now. When I check programs running etc, there is nothing untoward on the go that isn't on during the day. I half though the phone was not sleeping during this time but after 5:30 the drain stops and it goes back to normal.