1 In the interests of safety and hygiene please ensure that your Thermos flask is cleaned with warm water and washing-up liquid prior to initial use.  For best results from your flask, before use, pre-fill for about 3 minutes, using either hot water for hot drinks or cold water for chilled drinks.
Extrapolating these findings to the general population, the authors estimated that 8 million elderly persons nationwide have insomnia on any given day, more than 1 million new cases of insomnia develop each year, and symptoms resolve in nearly 1.3 million elderly persons annually.
Insomnia is the most common sleep problem. Women are more likely than men to report insomnia. In fact, according to the 2002 NSF Sleep in America poll, more women than men experience symptoms of insomnia at least a few nights a week (63% vs. 54%) and they are more likely to have daytime sleepiness.