macbook pro beeping 3 times?

[maja]

I keep my laptop running most of the time, and at 4 o'clock this morning it started beeping at me. 3 times, then again, and again. Talk about a rude awakening! The screen was dark and did not respond to keys or mouse clicks. I pressed the power button until it was quiet. I waited ten minutes and did some quick research on my ipod. Apparently the ram may be the culprit. Except, I just turned the macbook pro back on and everything seems to be just fine. I'm using it to write this. Random glitch, or can I expect a repeat performance? Any insight would be appreciated!