Dual mode of existence

I have dual mode of existence when it comes to work/studies:

One in which I am really sincere, hardworking ahead of schedule blah blah...but then every once in a while ..due to whatever reason there might be, i slip into another mode. this mode is exactly the opposite..wherein i come into work. due hardly anything useful as to even to fill my workhoues and keep postponing things for no apparent reason. boredom is it what it is ?

This i have noticed about me ever since my school/college days. in school it set between my 11'th and 12'th stds. somehow picked it up in my 12'th towards the cbse finals.

was good to go in BITS but slacked in MS. again at work have been good for the past 1 year..but seem to slack since the beg if this year.

the irony is I really want to come out this and be my sincere self again. Hope to come out of it soon . have a big deadline looming in front of me!

Is it me or are there any one else out there like me ?