Smiling During Meditation

I meditated a few hours ago. The meditation lasted for a brief 10 minutes and I think I could've gone deeper had it not been for the external noise. I caught myself smiling without my control during this meditation session unaware of the reason for the smile. I remember experiencing this with the hemi-sync cd. I felt so calm and at peace.

Right now my main goal for meditation is to connect with my inner being / higher self. As well as meditating now (hopefully on a daily basis), I intend to listen to the hemi-sync cd before sleeping.