IPhone 4S and have just installed iso7?

Okay so I have just installed the iso7 on my I phone yesterday and its all going well but every time I get a notification on it like from Facebook or something my screen will light up witch is good but then it won't turn off with out me turn it off like with my hand is there a way I can like set a timer for it to show for 10 seconds then turn off?

N helplook i