It woke him up one night this weekend.  We both noticed it the first time she was here in June, she did it constantly for about two weeks or so then stopped. (Even then, it took him like a week and a half to notice.  Guys are slow)    But he is just noticing it again and putting together that it may be a problem.  I haven't said anything to him.  I have just been letting him talk it out.  Don't know if it is my place to say anything.