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Yes it's ok to leave it on charge because all Li-Ion battery packs have a dedicated charging circuit and on-board microchip that monitors voltage, current, battery temp, etc., and shuts off the current flow when the battery is fully charged. You CAN'T hurt it by leaving it connected to the charger overnight...it'll charge till it's at 100% then shut off the juice.I switch off and charge every night. Should I just leave it on then. over night is still the most convenient time to charge though. IS it ok leaving it charging all night?

I switch off and charge every night. Should I just leave it on then. over night is still the most convenient time to charge though. IS it ok leaving it charging all night?
Just be aware that when the phone is on and the battery is fully charged and the power is cut off, your phone will use battery as it would normaly without it being plugged in to the charger. Happened to me once, woke up after a full overnight charge and battery was 93% - turns out it had stopped charging at about 3am!
shouldn't the charger kick back in?
Actually that's incorrect. Li-Ion charging circuits are designed to cut off the charge when the battery is fully charged, but after that it monitors the charge level and if the battery drops below 90%, it will run a lower output top up charge to bring it back to 100% (similar to a trickle charge). But unless you're using something that drains the battery heavily during the night, there is no reason for it to top up again. During the night my Desire typically drops only 2% and the only thing I turn off is the GMail syncing so I don't hear notifications in the middle of the night. I have alarms setup to wake me, and all of my other settings like GPS, 3G, etc. are on 24/7.No, it cuts off to protect the phone and battery and you would need to reconnect the charger for it to start charging again.
Overnight the battery only drops by about 10-15%

I turn mine off every night. Can't see the point in keeping it on really, i'm asleep!
Likewise.
I'd never have guessedi turn mine off wenever im at school, then i turn it on sometimes in certain lessons [english mostly coz i get bored =3], and at break and lunch

