Well, I just happen to be the Technical Director of a Sleep Disorders center, with 17years experience in diagnosing and treating sleep disorders.
There are several things that can cause Hypersomnia, or excessive sleepiness. And yes, frequently that complaint is difficulty in awakening.
If she has anything that is disrutping her normal sleep episode, such as apnea, Periodic limb movements, snoring or some other sort of intrinsic sleep dosorder, EDS is frequently the chief complaint.
Poor sleep hygiene (Irregular bedtime, ireegular wake time, usisng the bed for other things besides sleep and doing the pelvic cha-cha etc...) can also cause it.
Failing that there are other disorders, such as Narcolepsy that have hypersomnia as a major complaint as well. Sonds ike she **might** have a touch of INSOMNIA at the outset, which could disrupt her sleep as well.
If all else fails but the patient is still sleepy by our testing, we will issue a diagnosis of "Idiopathic Hypersomnia" which essentially means you're pathologically sllepy, and we aren't exactly clear as to why.
I would suggest if it's a problem for her that she make an appointment to see a sleep specialist, who will be more reliable than internet research
IM me if you have any more questions
SG