Ok I have been having a lot of lucids dreams lately, 6 in the past 4 days. All of them put together lasted like less than a minute however. Well all of them except for one I had this morning.
I had one dream before it where I tried spinning and it went really bad(woke up as soon as I stopped), so I was worried I would wake up in seconds again and I tried something different. I was near a swimming pool and I dove in then I sank to the bottom. I sat there at the bottom of the pool, breathing in and out under water. Could feel the bubbles going up when I breathed out.
Everything got VERY clear, so I got out and walked around a bit. I could see everything like I was awake, and it was bright outside instead of kind of dark like a lot of my dreams. I got worried about waking up after awhile though so I jumped back in and tried again. I closed my eyes the second time though and when I opened them I was in a different place.
I was thinking very clearly though, even though the place looked a lot like my house was some small things different and I remebering thinking "Hmm I was just at the pool and now I am here, so I must still be dreaming" so I stayed lucid and walked around. It lasted awhile untill out of no where I just woke up.
Now I doubt you can find a pool in a lot of dreams but I think sitting down, relaxing and taking slow breaths might help. Nice thing is after I stopped it kept working. Normally when I try to spin or shout out commands it works, but then a few seconds after I stop it goes back to how it was.