RMC : Actified Antihistamine is not found in night nurse...so still no wiser as to whether its safer than Melatonin. Come on Doctors help me out on this.
300-600 : You can get the Sleep Master cheaper (and quicker) from ebay.co.uk. Mine is still going strong despite almost daily useage. Only problem is you only get one pair of ear plugs 39 decibel ear plugs ...so if you loose one your stuffed.