I'm finding myself wanting to experiment with lucid dreaming techniques and after becoming lucid for the first time, but not really being able to do much with it (it ended rather shortly without me having a chance to do anything) I have this URGE to have another one.

The problem is that I can't seem to fall asleep very easily, and I want to try sleep during the day when I have some free time.

So, are there any common sedatives I can use to knock myself out without impairing my ability to dream?