It is best to avoid laser hair removal during pregnancy. For one, your hormones are changing so significantly your skin could react differently or it could not work and more hair will grow or change after the pregnancy. Technically it should not penetrate enough to harm the fetus, but I would...
Any type of laser treatment can cause hyperpigmentation. Ensuring that your treatments are being done by a licensed and well-trained professional as well as following your provider's pre and post-care instructions can help minimize the risk.
Never heard of this, however if you have insomnia, sleep health is optimal for overall health and wellbeing. Maybe lower the dose, but again, sleep is esential for life.