Call it a night!

I have been finding that I am winning lots of s&gs and sometimes I can win alltogether 150 dollars a day, then take into acount my by ins its about 90 profit, but I always end up carrying on and barely break evens some time, its like I need to walk away when reach a target, but I dont want to have a money target because I dont wont to be under too much pressure. What do you guys do, when do you call it a day?

I generally stop playing whenever I make a bad decision that costs me...

Thats usually a sign that you need to take a break and recharge your batteries.

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Dont play when tired - after all why do you feel tired, its your body telling you that you need to rest or sleep.

As for playing to reach a target can also be bad as what happens if (for example) you have almost reached your target and get dealt AK?
i : do you play normally (however that may be) ?
ii: do you play aggressive (hoping to force others to fold)?
iii: do you limp in hoping to cash in when / if you hit the flop?

Now without a target in mind but still having been successful and you get AK you should be able to play such a hand your normal way without worrying about possibly losing falling away from your target

Enjoy and Peace

I keep playing as long as I'm doing well. Once I drop a few SNG's I usually quit for a while - TV, book. If I go back and don't place in the next group (I play 3 or 4 at a time) then I'm usually done for the evening.

When you are confident, you will play better - taking some beats usually convinces me to quit for awhile.