[lccerina]

Sleep researcher here. The most detailed you can find would be "principles and practices of sleep medicine", but that would not give you direct advice on how to solve your problems, more a general understanding of that.

If it's Insomnia, consider a cognitive behavioral therapist. If it's something else, look for the right expert. It can be also an external condition (e.g., do you live close to railways, airports, chemical plants?), diet and lifestyle, genetic factors etc... Without knowing what is your main sleep complaint is difficult to advice you.