My husband snores all night every night. He has been to a gp, ENT and had a sleep study with no solution what should we try? Nose strips don't work.

Dental evaluation. Best to see a dentist who works with snoring appliances or research "nightlase" dental laser snoring reduction. We are training providers in many states .
CPAP. Although not covered by insurance in the absence of a positive sleep study is very effective at controlling snoring. Many units can be purchased for under $500. Nasal pillows work well and are well tolerated by many who don't like the mask. Weight loss if appropriate is also advised.