Macbook pro 13 inch 2017 W/ touch bar - battery drain during sleep OS Version I'm on is High Sierra 10.13.2

My battery seems to drain way too much on my new MacBook Pro 13 w/ Touch bar 2017 when it's supposed to be sleeping.  Things I've done after reading other posts on the issue:


Turned off power nap on battery in the settings
Turned on Do Not Disturb whilst sleeping


After a test yesterday, at the end of a day the battery went from 100% to 84%, I didn't open the lid once in that time.

I don't recall ever having this issue with my MacBook Air mid 2012.

Is this a software, hardware issue or both?

Thanks

UPDATE 01/01/2018 - Happy new year! So I did as suggested in reply.  Nothing was open preventing sleep.  20hrs this time on sleep and down to 78%.  This can't be right!
If you open Activity Monitor there is an Energy tab that will display what is consuming the most energy. One of the columns is "Preventing Sleep", which will allow you to see if any apps are preventing your Mac from sleeping. It could be that it isn't sleeping when you think it is.

If you leave Activity Monitor open for a while it will gather data and you can look through and see what the biggest culprits are for energy usage. You could have a program that hangs and uses more power than it's supposed to.