thats also a problem i am regional maintenance manager and if bloody operation going on smooth there is no need of me and my team even i wakeup 8pm . its job which needed when there is problems or else i have accounts purchase and invoices and emails to do which is daily work .
Well, then get yourself a routine!
Like waking up everyday at 7 am, going for a walk/jog then come back have a shower, breakfast. Do some office work, read a book if free. Get a hobby, maybe R/C flying, plants? Music? Reading? anything.
ya market jaoon ya kahaan jaoon mera to boss bhi 1 bajy uthta hai CEO shayed raat 8 bajy uthta ho ga riyadh main 
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perhaps log onto PDF ever second day and go for a run with all the free time you have ?