If your headache happens when missed on sleep your trigger may be fluctuating brain chemicals. Too much or too little sleep can disrupt the balance of chemicals in the brain, which can lead to headaches. Certain chemical changes take place in the brain during sleep. If a persons sleep schedule is disrupted these chemicals may take a while to get back in balance and a headache can result. If your headache happens when the weather changes your trigger may be a shift in barometric pressure.
Atmospheric pressure shifts or changing wind patterns can also cause headaches.
Seasonal changes especially from summer to fall and from winter to spring can cause headaches. If your headache happens when stress levels change your trigger may be adrenaline and other hormones. Both good stress and bad stress can cause headaches. Adrenaline and other hormones are released when you're under stress. Yhese can bring on headaches.