Yes do everything Griffon said and include the W.B.T.S method (wake back to sleep). I'll usually wake after 5-6 hours of sleep, record my dreams staying up for 30 minutes to an hour and then fall back to sleep using the M.I.L.D or W.I.L.D. technique. I normally always have a LD or LD's when doing this.

How long have you been trying to LD?