I feel bored

Hmm I will try to make it simple. You get sleep when you are bored. You may be bored for anything, or feel not in a mood of doing something. I myself am enthusiastic sort of person, but I get sleepy when I watch a boring movie or am on a boring lecture time.

Your problem is that you feel sleepy or bored simultaneously, which brings me to think "You think a lot for your future or anything alike to think that much"

Yes this is relevant, because this is how human brain works. The more you think about a particular thing, and constantly and that too in a negative way, your brain will try to find out answers and the best way your brain can do such thing is to send you to sleep.

You have to try not to think of unnecessary things or being negative. In contrary to that, you should stay calm and keep doing efforts to any goal you might have. When you send your brain signals of doing something, the brain will automatically develop emotions and try to figure out 'how to' ahead your goal and this will defeat sleep by eliminating it from your routine.

Don't stop until your goal is achieved.

Good Luck!