[][Xperia 10ii] Very, VERY strange battery drain during night time

This happened last night during sleep time.
No condition change (no new app installed, only Fernschreiber and Clock minimized), same as every night before I go to bed.
Only WiFi turned ON (Android App Support OFF)
Anyone else experiencing these sudden almost 60% battery drops???

Sometimes this also happened to me. After the last update and also after earlier updates. No idea why. It happens a few times and stopped then. Or happens as a seldom event from time to time. Most nights battery drain is abt. 5-15 %.

A similar problem occurred to me several times. In each case it was some Android media service and a process named sdcard tat caused the drain. Stopping AD support did help