A big day ahead, a lot of work, and have to get some good sleep. is it effective to take estazolam tablets?

In my opinion, no.: Estazolam or "prosom" is an fda approved hypnotic agent meaning it promotes sleep. It has a rather long half life so it is still likely to be having some effects the next morning. For this reason it is also used to treat anxiety and for the same reason you may not wish to choose this sleep aid. Sporadic use of another hypnotic with a shorter duration of action might serve you better.

Prosom: Per Drugs.Com some of the more common side effects with use of Prosom (Estazolam) can include memory problems, headache, dizziness, feeling “hungover”, sedation, GI upset, dry mouth & difficulty with coordination. This medication can become addictive. If it is used, use should only be short-term. It can be effective in getting a full night of sleep but morning grogginess is often an issue.