We found one dictionary that defines the word difficulty falling asleep:

Medicine (1 matching dictionary)

1. University of Maryland Glossary of Medical Terms (No longer online)

▸ Words similar to difficulty falling asleep ▸ Usage examples for difficulty falling asleep ▸ Idioms related to difficulty falling asleep ▸ Wikipedia articles (New!) ▸ Words that often appear near difficulty falling asleep ▸ Rhymes of difficulty falling asleep ▸ Invented words related to difficulty falling asleep