What skills can I advance while I'm away from my keyboard?

I would imagine that if you stood in a town and went into sneak mode, you would continually go up in sneak levels...

Technically, this is cheating isn't it? :/

All Armor skills and block using... Slaughter fish!

Stand in water, equip armor type you want to raise, go afk.

I highly recommend you drink a health regeneration potion, as slaughter fish CAN hurt.

I will admit I have yet to test this, but it worked in other elder scrolls games, and in this one, armor has no durability... so afk seems fine. I have encountered slaughter fish in lakes, and they didn't do anything but startle me when they attacked. No real damage, but that could just be luck. I was wearing leather armor (fine) and had under 20 light armor skill at the time though, so I assume it is save as ever.

Confirmation will come tonight, unless someone else verifies before then. But I've used this in other ES games, and their damage in this one seemed low enough to do it in this one.

Restoration: If you have a 100% less majicka enchantment for restoration, and use an elastic band to hold down dual-casting healing, you can just stand in front of low-level enemies to level up. The enemies will slowly chip away at your health, and you will continue healing/levelling restoration. Alternatively, cast equilibrium opinion in one hand, and healing in the other.

Sneak: Go to Dragonsreach, go upstairs, turn right, and go through doorway on to the balcony above the main area. Sneak, and use an elastic band to keep your character running against a pillar.

Block + Armors: For block, use an elastic band to hold down the block key, and for armor, just equip the armor type you want to level. Stand somewhere where you can only be attacked from one direction, ensure this is the direction you are blocking and wait for enemies to attack you and level you up.

These may take a while, so just leave them on overnight.