Trouble removing baby from boob!

[sometimesyouwin]

Not sure if this is best here or under feeding but it's more of a sleep issue.
DS2 (7mths) is breast fed to sleep at night and sometimes for naps. This works for us and I did the same with DS1. The problem is I now seem unable to remove him from my boob without him waking up and crying. He used to come off easily and stay asleep but every time I try and remove him he cries. We co-sleep but he basically ends up attached to me all night. Does anyone else have the same problem or any suggestions? TIA