Cover your vessels

I came across the article : Never Drink the Water from your Nightstand that explains how drinking from a water left overnight, can be harmful because it is susceptible to particle dusts or air-borne bacteria.  

This immediately reminded me of the the hadith about leaving water vessels uncovered at night :

Jabir b. 'Abdullah reported Allah's Messenger (ﷺ) having said:

When the wings of the night (spread) or it is night, restrain your children (from going out), for the Satan is abroad at that time, and when a part of the night is passed, free them and shut the doors. making mention of God's name, for the Satan does not open a closed door; and tighten the (mouths of waterskins and mention the name of Allah, cover your utensils and mention the name of Allah even though you should just put something on them, and extinguish your lamps.

Reference : http://sunnah.com/muslim/36/124

It proves to me yet again - how following sunnah and especially God's commands - are only for our own benefit.  God knows best what is good for us and what may be harmful for us.