Sleep Training for naps-need advise

Toni828

My twins are 7 months old, and sleep great through the night 10-11 hours.  But naps are another story.  They usually will only get 30 mins. of sleep and then seems to be wide awake.  I put them in their crib sleepy but awake, most of the time they do not cry.  Sometimes they will fall right asleep and other times they will roll around, play, talk, etc. (they sleep in separate cribs). This week I have not been getting them up after the 30 min wake up time but leaving them in their crib to go back to sleep.  Most of the time they just play and after about 30 mins of that or more, they finally get mad and start to cry.  I would like to get at least a 1.5 hr nap with 2 naps during the day.  So that is how long I am leaving them in their cribs. I check on them, etc. but 9 times out of 10 they do not go back to sleep.  I don't know if they just don't need the sleep or if I am doing something wrong here, but I'm sure you can understand my frustration.  I need a break too and I know they need their sleep.  I guess what I am really wondering is if it is unreasonable to leave them in their crib that long if they do not go back to sleep? TIA!