I've got an issue with my stock and rooted Nexus 5 (4.4.2). Based on what Better Battery Stats shows, the device is always Awake (see attached screenshot "Nexus-5-Never-Sleeps_c.jpg"), or, put differently, never in Deep Sleep (→ "Nexus-5-Never-Sleeps_g.jpg"). Additionally, I see that there's a *backup* Partial Wakelock, which is always running (→ "Nexus-5-Never-Sleeps_d.jpg").
While the battery drain isn't that bad (-17% in 7 hours), I still find that pretty strange. The device was "idle" all that time (ie. just lying there, with constant Wi-Fi and screen basically always off, receiving SMS and vibrating at times).
I have switched from 4G to 3G data connection and have disabled Dropbox photo sync. I also turned off Google+ pictures auto backup (and also sync of Google Fotos and Google+ Fotos in the account sync settings).
Hm, ja, well, how to allow the device to go to sleep/how to find out, what's keeping it awake? What's that *backup* wake lock?