I've taken Lex 10mg since 2007. Last Christmas my doc put me up to 15mg to deal with sleep difficulties. I'll share a few of my experiences with Lex.
1. Start up is hell. The first 1-2 months of starting or increasing can not be taken as an indicator of if it will or will not work. My symptoms included jaw clenching, sleepiness, loss of appetite, stomach ache, head ache, apathy, fatigue, night sweats. This goes away. I do recommend tapering on to minimise these.
2. These side effects do pass and lessen with time. Even the annoying can't orgasm one!
3. I can't cry at all.
4. I didn't put on weight -I lost it at first due to loss of appetite, but have remained stable since.
5. It's not a cure - I see it as allowing me breathing space in order to put other supporting structures in place for myself - yoga, meditation, mindfulness reflection, journaling, exercise, eating right among others. It's just one tool in the toolbox - no more no less.
6. It has helped me manage bad PMS symptoms in that I don't get the extremes of mood fluctuations, fatigue and irritability that go with it.
7. The increase from 10 to 15mg did help my sleep quality improve but am still feeling slightly lacking in motivation, energy. But hey I look well rested! And I expect that will pass. I function OK at work and do what I need to in my own life. I figure I can let go of the rest and take a restorative nap if needs be

8. My ability to deal with emotional setbacks has increased. For example last year I had several instances where several people I trusted let me down very badly. I did feel hurt, angry, disappointed, betrayed, confused and struggling to find enjoyment in simple things. These feelings are a normal part of life and I do not have the expectation that medication will take all the bad things away. What it did do is help me to not fall into a pit of despair and withdrawal and non-functioning while I worked through those difficult emotions.