Why does Youtube play paused videos at 3 in the morning?

[inukjuak90]

You can leave your computer "on" overnight -- even all week if you want -- but
it's not advisable to leave any browser windows open, because while they are
left unattended, Java Scripts & sub-routines are eating-up your Memory/RAM.
Leaving a YouTube (or even a Yahoo!) page open will definitely clog things up.

Whenever things seem stuck or slow, do the following, then shutdown/reboot.
You're gonna love it.   :-)

Mozilla Firefox:
→  Tools  →  Options  →  Privacy ('key')  →  Clear Now
[x] Browsing History
[x] Cache
[x] Cookies
[x] Offline Website Data
[x] Authenticated Sessions
→  Clear Private Data Now

Google Chrome:
→  ≡  or wrench  → Tools  →  Clear browsing data
→  the beginning of time ▼
[x] Clear browsing history
[x] Empty the cache
[x] Delete cookies and other site and plug-in data
→  Clear browsing data

Internet Explorer 9 and 10:
→  Gear (icon)  →  Safety  →  Delete browsing history
[x] Temporary Internet files and website files
[x] Cookies and website data
[x] History
→  Delete

Internet Explorer 11:
→  Settings ('gear' icon on the far right side)  →  Options
(then under History)  →  "Select"
[x] Cached images
[x] Cookies
[x] Browsing History
→  Delete

Don't forget to completely shutdown & reboot afterwards.

:-)