Who is not yet familiar: Diphenhydramine is an old anti-allergic, is no longer used as a result of this tired making effect and has instead found its place in the range of over the counter "sleeping pills". I wrote "sleeping pills" for good reason in quotes, because you should and should not have the effect of prescription sleeping pills, which cut down and force a sleep, confused.
Also Dorm tablets, like any other with said drug, not a means for all sleep disorders. There are many different triggers such as stress, psychological pressure, too late eating, lack of exercise, as well as electro-smog, mobile phone or laptop radiation etc. to which one has to take care permanently beforehand and especially to find sleep.
Tablets are a tool, not a solution.
As an auxiliary function Dorm tablets well and especially without Hangover the next day - so you get up to a time that is in the morning after 5 or 6 clock clock and get up the tablets not only 4 hours before taking.