Could Lack Of Morning Erections Be A Sign Of Erectile Dysfunction?

Dear Doctor, I am 28yrs old male. I am married recently. I have been masturbating regulalry from my teenage and also used to watch porn(but never used porn for aiding masturbation). Now, from recent days i am not getting morning erection regularly. some day i have , some days i dont have morning erections. During sex with my partner i used to have gd erections and iam able to perform successful intercourse. but i cannot hold my erections for longer period. Pls could tell me having lack of regular morning erections is a sign of ED. If so, is it reversible and does it have any solutions.