Suvorexant
"I've been battling insomnia for almost 5 years, mostly sleep maintenance.  I've tried every medication under the sun.  Belsomra is the new kid on the block and works very differently than all other "sleep" drugs (via orexin/hypocretin receptor antagonism).  I've been following and waiting for this drug's release for years.  First night at 20mgs, I slept 8 hours without waking once, something I haven't done in years, but boy, does it  sure cause next day sedation.  Well, tiredness is a better term.  Doesn't cause a "hangover" effects like other drugs, just a tired feeling is the best way to describe it.  Will try 10 or 15mgs and see if the next day tiredness lessens."