Re: 4 month old sleeping 830p to 7a
with LLLMeg. Your period is back because either a) your baby is sleeping so long (>6 hours without nursing allows prolactin levels to drop so temporarily low that estrogen levels rise high enough to provoke a menstrual cycle) or b) the IUD has hormones in it that are making you have either true periods or "breakthrough bleeding" (short periods of spotting in between periods of more normal length).
Whether or not this is a real problem or just an inconvenience and a surprise depends on how your baby is behaving. Does he seem satisfied after nursing? Is he producing adequate wet and poopy diapers? Is he continuing to grow normally? (Please note that around 4-6 months or thereafter many babies drop some percentiles as they devote increasing amounts of calories to motion instead of lacking them on as fat.)
LLLMeg gave some excellent suggestions, especially about waking baby to nurse. It's much easier than pumping!
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"