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 affects people of all age groups but people in the following groups have a higher chance of acquiring insomnia. 1  Individuals older than 60. 2  History of mental health disorder including depression, etc. 3  Emotional stress. 4  Working late night shifts. 5  Traveling through different time zones.