Much of Bedtime Bootcamp Challenge is about boundary setting.  I think setting boundaries is one of the hardest parts of parenting.  Seriously, and no one talks about it.  Boundary setting is not about flexing your authority or power.  You can set boundaries and still support independence and flexibility.  I do.  Children like rules.  They like to know what the limits are.  Without limits, they can feel anxious.  If limits change from day to day or situation to situation, children are left with no choice but to test the limits.  And see if they can get you to change the limit.  However, if the limits are always the same, and they test the limits, and the limits down change, and they test them again a different way, and they still don't change, their anxiety and wondering about what the situation will look like will go away.  They can relax.  They can accept the limits, and move on with their lives.  However, children also like choices.  They like to make decisions themselves.  They like to be creative and come up with their own idea.  They don't want to constantly be told what to do.  Or nagged at.  They are people too, just like us.  And so, it is one of the kindest things you can do to set boundaries, as long as they are appropriate.  When I suggest boundaries, they must always meet 3 out of 3 criteria.  They must be age/developmentally appropriate, in your child's best interest, and kind.  The boundaries are the outer limit of what we are willing to accept.  That leaves room for negotiation and flexibility inside the boundaries.  That gives each family room to decide what is best for their family inside the boundaries.  The reason I think setting boundaries is hard is because sometimes they aren't what our children are asking for.  And we want our children to be happy.  It hurts to see our children sad.  Or struggle.  Or have to work to get through something.  However, once you decide on a boundary related to sleep, perhaps because your child's current sleep situation is not working, or is just no longer serving you, and you know that is age/developmentally appropriate, is in your child's best interest, and is kind, when your child resists, pushes back, cries, begs, gives you the saddest puppy face, you can take a deep breath.  Because you know you set the boundary because change is needed, and you know it is developmentally appropriate, and you know it is in their best interest, and you know it is kind.  When determining boundaries, I would encourage you to discuss and determine boundaries with your partner.  You will both want to be on the same page.  So both parents can feel good about the boundary and follow through and support each other if your child tests the limits.  From what I am learning, boundary setting doesn't go away as our kids get older, just the topic of the boundaries change.  If you feel good about your boundary, you will feel good about the results.  The puppy dog eyes and the cries and the tantrums you must wade through to get there will be worth it.