Just started zoloft, (sertraline) experienced more vivid dreams, everything seems bright and a sense if euphoria- is this a healthy/common side effect?

It's yours: If you like it - enjoy it. If you're not sure, watch and keep a diary w/ your thoughts and feelings day by day about the effects. Report them to your therapist/doctor if you want a 2nd opinion to yours. If it's raining on a day w/ only a 20% chance - do you get less wet? How common doesn't matter - this is you. Healthy will mean feeling okay more than not and able to do what you need/want to do.