Hi. I'm online and happy to answer your question today.
It is not unusual for a deep bruise to take a bit to show on the surface so, as far as this and the small amount of swelling you are experiencing -- as long as you are not having any other symptoms -- you should be OK.
I'm not, however, clear on what happened after you bumped your head. Do you think that you hit your head really hard, perhaps hard enough to cause you be become unconscious or do you feel that you just went back to bed and fell naturally asleep?
Given your age it may be the better part of valor to visit with your primary care MD just to make sure that nothing else is going on secondary to bumping your head.
Does this make sense to you?
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I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)