Son's Many Potentially Sleep Related Problems

This is a question as to whether or not I should get sleep testing done on my son, or seek a different specialist. My son was diagnosed around age 2 with constitutional growth delay. His current pediatrician now says that he does NOT have CDG because bone age is appropriate.

Now, nobody can tell me why my son is so small. At age 8, he is the size of a 5 or 6 year old (this size issue is a strong paternal family trait).

He slept poorly as a baby, I suspect with undiagnosed reflux (strong paternal family trait, and his brother had reflux too). He did not sleep for 3 - 4 hour periods until 1 year old, and did not sleep a full 8 - 10 hours at night until 4 years old.

His growth and size was normal until around 2 years of age, when it dropped to around 5th percentile. Immature behavior follows with this familial growth issue, and does not resolve until growth catches up, usually in college, resulting in completely normal maturity in every way.

He is also an occasional bedwetter, a few times per month. He often does not sleep for the 10 hours required at his age.

Bedtime routines are good, healthy, consistent. He gets to sleep easily and wakes up with no problems. He wakes up on his own most times, but only after about 9 to 9.5 hours of sleep.

He has dysgraphia, and is currently ruled out for ADHD. We had psycho-educational testing done (just a few weeks ago) and in most areas of attention he was from average to superior. The only problem area was sustained visual attention. The neuropsychologist said this could be immaturity.

He also has high levels of anxiety and depression (could be dysgraphia related -- but could this be exacerbated by sleep problems?). All these things are making the kid miserable at school and preventing him from reaching his true potential. It is devastating to me to think that he will continue to suffer like this until he gets to college and the growth catch-up resolves everything.

One item that never resolved for my husband is that he still does not sleep well, and says even when he was little, our son's age, he remembers not sleeping well. He says he has never slept well in his life.

He has high blood pressure, another family trait. It is not affected by diet either. He is currently on 2 BP meds and it is barely under control, sometimes not. His mother takes at least 2 BP meds or more with the same lackluster results. My husband also suffers depression. There is too much family history of these problems to shrug them off as environmental. Our family eats healthy, exercises, and has consistent and healthy routines.

Should we seek sleep studies for my son and husband? Or do we need a different specialist?