Hello, Your testosterone level is at its highest in the morning after you wake up. It is highest immediately after waking up from rapid eye movement (REM) sleep stage. The increase in this hormone alone may be enough to cause an erection, even in the absence of any physical stimulation. But not getting enough erections during daytime is contradictory. Presence of sexual stimulants creates erection behavior and further erection. Your worry may not allow your body to accept sexual stimulation, so no erection during the daytime. Stop worrying about both. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr K. V. Anand, Psychologist