But infectious bacteria can make you ill. They reproduce quickly in your body. Many give off chemicals called toxins, which can damage tissue and make you sick. Examples of bacteria that cause infections include Streptococcus, Staphylococcus, and E. coli.
Getty Images/Fuse. Head down: Jet lag symptoms include feeling sleepy during the day in your new time zone. Jet lag is what we call it when your body is reacting to these changes in your environment, which is basically your body taking time to adjust to its new place and time. Symptoms include feeling sleepy during the day in your new time zone, but also having a troubled sleep at night.
Symptoms of jet lag can vary. You may experience only one symptom or you may have many. Jet lag symptoms may include: Disturbed sleep â such as insomnia, early waking or excessive sleepiness. Daytime fatigue. Difficulty concentrating or functioning at your usual level. Stomach problems, constipation or diarrhea.