Two jobs at the same time?

Hi lads, just looking for your advice here. Im currently employed full time by a security company. I do night shifts only and dont get paid neither night allowance nor sunday premium, more than that, company does not give me any overtime(even for flat rate), so the money i get is not enough for me. I was thinking to pick up another part time job in other security company so i would do extra shifts on my days off and have around 60 hours per week...

Does anyone do like this or its silly? Do i start to look for other security job so i can get overtime? What do you think...