Dear Krysia,
I must be honest and say I am very anti-co-sleeping. I feel it is bad for intimacy between husband and wife, and as you are experiencing first hand, it can result in an insecure and clingy child. Having said that I realize this is a very personal choice and each family should decide what works best for them.
Giving in to your four year old to avoid a tantrum is also unfair to your older daughter. Being forced to sleep in a small bed with her younger sister, must be a little uncomfortable. If your four year old is a kicker or restless sleeper, this too will prevent your older girl from getting the rest she needs.
At age four, she is old enough to understand what she is asked to do. A good solution would be for your children to have their own rooms. If this is not possible, I suggest getting a divider screen and let each girl do a little decorating of their choice on their respective sides. Maybe a set of new sheets or comforter.
Make a privacy rule that they may not go over to their sister’s side unless they are invited.
Let your four year old know if she makes a fuss about sleeping in her own bed on her own side, she will have to start going to bed a hour earlier then her sister.
I remember as a child not wanting my mother to go anywhere without me, especially at night. I wasn’t a tantrum thrower, but I would go find a place and cry in my pillow. I know it made my mom feel bad for leaving me. I did not have my father in the home, in fact I never knew him, so in my case, it was definitely insecurity and perhaps the feeling of abandonment.
The next time you and your husband plan to go out. Get a calendar out and explain to her in advance that, “Mommy and Daddy are going on a date to spend time alone together”. Plan a special treat for your girls, and rent a movie or plan an activity they can do with the sitter.
Show her on the clock when you plan to return home. (She will probably already be asleep, but I think it helps a child feel secure if they have a few details.
Before she throws her next fit, talk with her about her behavior. Let her know you love cuddling with her and telling her stories, etc., but you can’t hold her all the time because she’s getting to be such a “big girl” and sometimes you have things to do around the house or need time to yourself.
I would also let her know that when/if she continues to throw a fit, she will be put on time out and loose some privileges. Whether she likes it or not, her father should get involved with discipline when she is acting out. Sometimes a man’s voice and strength have a better impact on a child.
Blessings…..