One could diagram the state of sleep as such:
The Parent and Adult ego states are decommissioned and one is left with the Free Child alone. That is why sometimes dreams are referred to as the windows to the soul. It is truly a way to see into the unconscious and the primal needs of the person.
With the two ego states decommissioned the FC is allowed to roam free and create what ever it wants which is what it does with dreams. It provides such a rich source of psychological material but many disagree on what it means and what is the best way to use it with clients. There are many, many different varieties of dream work.
To have good sleep the adult woman has to somehow psychologically get like the girl.
However getting into the state of sleep that is diagrammed above involves an interesting psychological process and this is why some have difficulty with insomnia. The way people talk about sleep states it fairly well. People are said to FALL asleep. People do not run into sleep or jump into sleep but they fall asleep.
People have to kind of surrender into sleep. It is a letting go process. To decommission the Parent and Adult and access pure FC involves the person giving into or surrendering to sleep, like letting self fall. Some have a lot of trouble doing this because it means they have to let go and trust. Letting go of the conscious and surrendering to the unconscious if frightening for some and hence they experience insomnia.
The same applies for the experience of love. People do not run into love or drive their car into love instead they FALL in love. To understand and experience this people have to do the same kind of surrender or submission that is required for the sleep state. Those who say they do not know what love is, can be because they are too frightened to do this letting go and falling process. Hence they can never experience the Free Child as it is shown in the diagram above and hence never have a true experiential understanding of love.
Finally sex also requires a similar psychological state, especially for the male. Some men who have difficulty obtaining or maintaining an erection, can be because they have difficulty with the same letting go process. If they cannot decommission the Adult and Parent ego states adequately enough that can lead to sexual difficulties as described.
The diagram shows a very child like state. When each of us are born we are psychologically like this. So in one way it is such a natural state to be in. However to release our control and indeed our very way of understanding and viewing the world is difficult for some. Also it seems safe to say that when people fall they quickly and instinctually reach out and try and grab onto something. To fall asleep one has to trust the fall process such that they do not instinctually grab onto their Parent or Adult ego state.