I have a five month old and she is on a bedtime routine. Between 6:45 and 7:00 we take her upstairs and play alittle, then we start a bath for her. She gets a bath, gets lotioned up with a little massage (I use extra virgin coconut oil on her skin, it smells great, you don't have to worry if she gets it on her hands and then in her mouth, its all natural, and a great moisturizer after bath) Then she gets snuggled and fed, rocked for about five minutes and she's out for the night. She expects this routine and if she doesn't get it she has a hard time going to sleep and staying asleep. I'm not sure why you don't want to bathe your baby everynight, but at eight months it's not going to overdry her skin. We use a infant non-soap body wash and only wash her hair every other day. Anyway, the point is, a routine is vital for you baby. They need it for security, everything is super stimulating for babies. A routine helps to slow them down so they can relax and rest, the predictability is essential for babies and children in order to feel safe and calm. I really suggest the bath. Its soothing, its a great bonding time and fun time for everyone (my husband and I bathe her together, I dry her off, he gets her dressed, I feed her, he rocks her and puts her to bed. Its a family event everynight. But mainly, you just need to have a set time line for her so she knows its time to sleep. Keep low lights, low voices, and no playing.