Forgetting he’s own birthday day

today in the morning, I texted my friend saying “Happy Birthday”. He responded me saying “oh yea, it’s my birthday” and I was so surprised when he texted me because I don’tknow nobody that forgets their own birthday. After I read the message I was laughing so bad like if there was no tomorrow. I really think that my friend was kinda half a sleep when he texted me because, him not remembering his OWN birthday is kind of weird.