If I get enough sleep I can wake up with the sun (I'm fairly sensitive to sunlight) and be functional in less than a minute. And I mean very functional, as in I could wake up, see what time it is, and do a math problem and get it right! Not that I would do a math problem, but I could. If I've had enough sleep, coffee just makes me jittery, but tea gives me a slight pleasant feeling. But if I don't get enough sleep, forget it. Actually, If I get regular sleep and I get one night of bad sleep, I'm still pretty alert. But if I get another bad night in a row, I'm screwed. I think the minimum is about two night's of good sleep for each night of poor sleep, and I'm still always functional. Coffee helps if I get bad sleep, though, but I'll get worn out faster. Tea seems to last longer than coffee, but is too mild to keep me going.
My girlfriend, however, gets real grumpy if you wake her up the wrong way. If you yell at her to wake up, she'll wake up really grumpy for about ten minutes. But if I go and mildly wake her by putting my hand on her shoulder and kissing her, she'll be much better. Of course, she locks her door when I stay over, but that is easily surmounted by using my NJIT ID card to release the lock. She doesn't complain.