Google Nexus 5 — WIFI Battery drain on standby

There are a few things that can cause this. Firstly, the battery life on the Nexus 5 seems quite random at the best of times. I've had days where it drops less than 1% an hour even with light use, while other days it can drop up to 5% an hour with no usage. The 4.4.2 upgrade improved this but it still seems to have these irregularities, according to some users. The next cause could be a weak WiFi signal, though if this is at home I wouldn't imagine that's the problem. You can check if the WiFi signal is particularly weak where you leave the phone, if so then go to settings, WiFi, menu, advanced and uncheck 'avoid poor connections' as this starts a recursive search for stronger WiFi signals, using more battery. Finally, while you're in the advanced wifi menu see if the 'scanning always available' option is checked, if so uncheck it as this definitely does use more battery, moreso if you use social apps. Personally I use a custom kernel and Greenify, though I would, being rooted...