Aluminimum MacBook Doesn't Sleep

[SleepyHead157]

hi guys, hopefully you can help me before I decide to go to Apple. I bought a new Aluminum MacBook, and I usually close the lid to make it go to sleep when I'm traveling from work to home. But today it got extremely hot. I could barely touch it. I realized the machine was still running, even though the lid was closed. When I came home I opened and closed the lid, it went to sleep but then turned back on while the lid was closed. What can I do to get rid of this problem? I'm afraid to trek to a Apple Store because they're going to say there's no problem. I don't have any bluetooth mouse or keyboard attached to the MacBook. My bluetooth is turned off. If anyone has any answers, i would appreciate it.