[sumedh]

One signal you can use for selling is if your investment starts giving you sleepless nights. If the value is going down and you constantly think about it then its better to sell instead of letting it affect you mentally.

[Sammi]

You did not afford to buy if you are fretting every short term price move.

[sumedh]

That is not true, you could have bought when the price was low but now when the price is high you are not sure if you want to sell or keep holding.