I check many times throughout the day, slightly addicted to blockfolio as I have a few altcoins and you can't really leave them for a month as they can change overnight, but I do think I check far too often perhaps I have developed an addiction to blockfolio just scrolling up and down.
Checking the price doesn't make anything to you. But coping with stress is important to take correct decissions when trading bitcoin or other altcoins. This is called self control when you cope with high stress.
Yes. It is not actually about the price checking, as I check price everyday so as not to miss the huge fluctuation for some of the coins I may be holding or to make some good market decisions. I usually buy markets at dip anyway when everyone is scared and already sold out and it simply looks like no one ready to sell anymore and as a long term trader, I already know when I should be stopping loss which most of the time, they hardly hit.
As long as you know how to limit the risk, you should always be fine, but lack of knowledge about the market, what some people really want from the market and so on, are some of the things that makes them base emotion when checking prices.