This is really maddening and obviously a glitch. Since the recent IOS update, once you unlock your fone, your notifications disappear. So if you have notifications showing on the Lock screen, but you don't have time to look at each of them right now, but need to use your fone, you lose all the notifications (for example, all those that appeared when you went to sleep will be gone once you unlock the screen). They are no longer in the notification center, they are just GONE. So if you wake up, need to make a call immediately so you unlock your fone, you LOSE all the notifications from during the nite before. This is patently wrong and needs to be FIXED!!!!