7 months already eh?
Waking up once or twice would be normal.
But if you say AT LEAST twice, then not too good.
before you can solve this problem, you've got to find out the cause.
since you say the waking up for suckling is more for comfort, then its pretty obvious that he is uncomfortable.
could it be temperature? Too warm, too cold?
could it be block nose?
could it be the bed? Did you change anything? Like a new bolster/pillow or brandnew bedsheet?