Y-Snore Nose Drops, a homeopathic product - experts said there was insufficient evidence it worked.

BBC: Snoring cures success 'exaggerated'

After that, the study subjects were quarantined for six days and given cold-virus-containing nose drops at a dose about 125 times the amount that it takes to infect cells in a laboratory.

CNN: Study: Can more sleep help fight off colds?