The causes of heart discomfort after waking up from a bad night’s sleep are physiologic, insomnia, and heart disease. It can be self-adjustment, taking drugs, psychological treatment. 1. Physiological: If you are overworked and stressed, there will be nerve dysfunction, resulting in insomnia, palpitations, etc., which can be restored after sufficient rest. 2. Insomnia: Insomnia can increase the arousal of the nerves, leading to poor sleep and heart discomfort after waking up. Dexzopiclone, oxazepam, etc. can be taken. It should be combined with cognitive behavioral therapy. 3. Heart disease: heart disease can cause chest pain, palpitations, chest tightness, breath holding, etc., which can also lead to insomnia and poor sleep. You can take nitroglycerin, captopril, metoprolol, hydrochlorothiazide and so on. If it does not get better after resting you should seek medical attention. Medications should be used under the supervision of a physician.