That LOL Moment

ok few days ago it was birthday of one of my colleague and in the morning round about 11, i got message from one of their friend that today is her birthday please do wish her, but i was really shocked to see that they have sent me message at 11 in the night and i was waking in the night at that time and also that i was logged in the Facebook, then how it is possible that i missed that message anyhow i wished my colleague and then again checked the previous message so i realized that it was sent in the morning and then i laughed really loud. and really when i did not knew the time of receiving the message i was really curious that how it is possible to send a message without get in notice of other person.