I'd say leaving it one all the time is a bad idea. It will get very hot (in the summer) and anything can happen to it while you are sleeping. Say there is a power cut or something. :/ I'd just turn it off when you go to bed. Leave it on if you are going away for an hour at most, and someone is still in the house, to make sure nothing bad happens to it.
www.mycutelobster.co.uk
"Of course it is happening inside your head, Harry,
but why on earth should that mean that it is not real?"
/ 
Leave it on if you are going away for an hour at most, and someone is still in the house, to make sure nothing bad happens to it. 
