Chairs are for sitting, not storing a backpack.
Put a loop of rope on the pack hoist loop, and you will be able to hang the pack from most bunks.
Half the space below the bunk belongs to each of the top and bottom occupants.
Don't lie directly on the mattress.
Packs can be pretty dirty, which is why you should avoid putting them on beds.
Lights out at 2200 generally.
Almost everyone will be getting up at 6 a.m. in the summer. If you want to sleep in, albergues are not the right place!
Lights will usually be turned on at or before 7 a.m.
Hospitaleros will probably throw you out at 8 a.m., sometimes quite rudely.
Never set your alarm.
Phones on vibrate (no one wants to hear it ring at two in the morning).
Share the hanging space on the ends of the bunks.
Prepack if you plan to leave early. Don't use "crackly" plastic bags.
Bring ear plugs. You cannot control the snoring of others, so plan to accommodate it.
Take showers of modest length. Often hot water heaters are under-capacity units.