If you use Windows OS:
My first response would be to close the program via the File > Exit if that is available. If not, use the Task Manager and close the process for it.
Then do a computer reboot.
If that doesn't fix it, not sure what will. Normally those buttons are not part of the program but a windows thing. I've seen just one where I could turn that off but it was a graphic program. Hmm, wonder if you went into a kind of "full screen" mode? Did you try the Esc key?
If you use Mac OS:
Can't help you with that.
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Breathe deeply and count to zen.
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You might have gone into fullscreen mode in SleepyHead. Press F11 to toggle.