For susceptible people, fatigue is often a trigger for skipped beats. Skipped beats are usually either
prematurePremature ejaculation
Premature infant atrialAtrial fibrillation/flutter
Atrial myxoma
Left atrial myxoma
Right atrial myxoma beats or premature ventricular beats. Premature atrial beats are almost never dangerous -- I really can't think of any cases where they are dangerous. Premature ventricular beats are very rarely dangerous. If you have an otherwise normal EKG, a normal history and physical exam, and structurally normal heart, PVCs are benign. Sometimes a stress test is indicated, but not always.
You should talk to your doctor, but probably not a reason for concern.
I hope this helps.
As for your "skips" I find fatigue and a few other things will trigger more. But usually PVC's are pretty harmless. They're just annoying at times and doctors may treat them if the patient is bothered by them.