If the strip is intact in the morning, you have not had any erections during sleep, meaning something is wrong with the mechanics of the system. See a urologist for further diagnostic work. If, as is more likely, the ring of stamps is broken, nothing is wrong with your penis. Instead the problem has to do with interaction of your mind and penis. This calls for counseling or therapy with a psychotherapist or sex therapist.
Men spend lots of money on products that claim to boost male potency, few of which actually work.
Yohimbine is a stimulant that sometimes appears as a street drug. Users report distinctive and pleasurable tingling sensations along the spine and in the genitals. Manufacturers say it increases erections in men. Currently it is a prescription drug, available under the brand names Yocon, Yohimex, and Aphrodyne. Yohimbe bark and extracts are sometimes offered for sale in health-food stores.