The (latex containing) packaging the strips are individually wrapped in give off cool flashes of light when you open them in an unlit room.
These are handy when you have a cold. It's notoriously hard to lie down and sleep when you have a cold but these make it a bit easier.
Or eating grass...according to Houllier :D
Filled this in a few times (it often appears on Freebies)..not received a sample yet.
Promote easier breathing, commonly used by people who snore.