Hi there, all I can do lately is wild, because my dreamrecall is not what it used to be... what probably happend, is that everytime you feel that wave of heaveyness(wich is you entering SP), you stop relaxing, and that , but is the most important thing, if you wil react in any way on what you mind wants your body to do your bio clock wil restart.
next time when you enter SP try to change noting, nog the way your eyes point to, or move your fingers, just try to relax( wich is really hard) and tell your self you will enter a dream, this works for me anyways
took me about 3 months to really controll it.
give it a shot !
Jup