Of course there is no other way to keep bitcoins safe and that is to create 3 or more hardware wallet if you just intend to hold bitcoin. But, if you are trading it then definitely that would be risky and it will compromise your holdings for there are many scammers, hackers, and fraudsters out there. Hackers would be the main reason getting out your bitcoin while your sleeping and the other reason if your bitcoin will be stolen is just due to your ignorance.