charge issue, could this be a "wake lock"?

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http://androidforums.com – Sent my phone to bed last night with a 35% or so charge...plugged into my usb2 as per usal of my laptop... Woke to find only up to 75% charge.... this had happened a few days ago, andi found the screen "frozen", so then i had rebooted, and the phone was actually fully charged and all was fine... this time, no screen freeze, but i rebooted right away anyway...still at 75%... any thoughts? if a "wake lock" could someone review with me the process of determinging so... kernel and rom info in my signature... (General)