Yeah but they can still the coins from you while you sleep or even while you watch them.
The board if full of people losing their coins without trace.
Stealing? That won't happen if you store your coin safe and secure. Even if I put my Bitcoin in online wallet like blockchain.info you won't be able to gain access without knowing the identifier and password. You can't do that even if I'm sleeping. There are a lot of people got their coin hacked because they don't store their coin securely or getting phished.
The best way to store your coin is in hardware wallets like Trezor or Ledger. Hardware wallet like those two are secure and easy to access at the same time.