Energy can be stacked from sleeping. so feel free to spam it.

Only the tents/camps count towards the sleeping achivement.
So no hotels/inns or buildings!
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Locations:

Mountian pass: = 1 bread for 10 energy

Yellow forest: = 2 fruit for 10 energy

Crossroads inn: = 20 gold for 20 energy

Logger camp: = 1 meat for 14 energy (requires investment to unlock)

Military camp: 1 cheese for 12 energy

Town Inn: = 20 gold for 20 energy
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Cost

cheese (farms, lambs) 9 gold each

bread (Mountain Pass, Merchant) 9 gold each

fruit (mill, fruit seller) 4 gold each
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Conslusion: the most efficent way is to buy fruit at the mill and sleep at the Yellow Forest tent.

Hunting

Bears: Spear, 1 posion, 10 energy
Croc: Spear, 1 posion, 10 energy
Boar: dagger, 8 energy
Deer: bow, 4 arrows, 6 energy
Lynx: bow, 3 arrows, 5 hearts

The deer gives out several counts and the other animals only give out one.
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Fishing
Fish: Fishing rod, 1 dry fly, 2 hearts
Shieded fish: Net, 1 pheremones, 5 energy
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Herbology
Night Flowers: Sickel, x2 sacks, 4 energy
Herbs: 2 baskets, 2 hearts
Algae: Hook, 1 barrel, 3 energy
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Alchemy

Sun solution: Motar, 1 jar, 2 energy
Pheremones: (Shielded fish) 1 bushel night flowers/38 gold
Poison: (Swamps, Witchman) 1 Barrel alge, 3 poison mushroom
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There is a unknown chance for failure.
Thses things may happen: (I've lost my tool and didnt get any meat!)

1. Your tool can break.
2. You wont get any meat/pelts.
3. A consumable can be wasted with no reward.
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Consumables:

Poison: (Town, Smuggler) 85 gold (swamp, Witchman) 1 barrel alge, 3 posion mushrooms)
Bottle: (Farms, Old Medicaster) 14 gold
Sack: (Farms, Old Medicaster) 10 gold
Basket: (Farms, Old Medicaster) 12 gold
Barrel: (fishing village, Bait Shop) 14 gold
Arrows: (Farms, Brent the Hunter) 12 gold
Dry Fly: (fishing village, Bait Shop) 1 gold
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Tools:

Sickle: (Alchemist, Military Camp) 18 gold
Motar: (Alchemist, Military Camp) 35 gold
Hook (fishing village) 21 gold
Net (fishing village) 23 gold
Fishing pole (fishing village, Bait Shop) 19 gold
(Convient they sell replacements for their crappy always breaking poles)
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Weapons:

Spear (Military Camp) 110 gold
Dagger (Military Camp) 1 iron ore/50 gold
Bow (Farms, Brent the Hunter) 70 gold
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Rural Area
Mountian Pass
Yellow Forest
Secret Vally
Mill
Island
Crossroads
Fishing Village
Farms
Secret Meadow
Loggers' Camp
Dark Forest

Civilization
Military Camp
Mines
Town
Castle

The Heart of Evil
Alchemy Lab
Valley of Scarags
Dark Tower