Morning Wood: Having an erect penis when you wake is an indicator of healthy blood and nerve supply to the penis. The presence of NPT (nocturnal penile tumescence) also likely indicates that you’re physically capable of getting and maintaining an erection while awake.
If you stop experiencing NPT (nocturnal penile tumescence) or notice that you’re not waking up with an erect penis anymore, this may be an early sign of an underlying medical problem. Most likely, this is a sign of physical erectile dysfunction (ED).
