Read The Joy of Living: Unlocking the Secret and Science of Happiness by Yongey Mingyur Rinpoche. It will answer all your questions about meditation, how and why it works, what method is the best for you, etc. You can buy it here.
You can try dynamic meditations, especially if you love dancing or if you get bored quickly while sitting in a meditative pose. For example, Osho kundalini, it's one of the most popular.
You can practice it alone or with a group, there are a lot of the dynamic meditation classes, find one in your area.
You can meditate on your sleepy state if you feel sleepy while meditating. Even if you fall asleep it will work, maybe you will even have some lucid dreams as a bonus.
If you feel sleepy, raise your eyes and look up for some time. It will activate your mind. Then you can meditate any method.
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