According to the Mayo Clinic, signs and symptoms of muscle cramps include sharp spasms or contractions usually in the legs or feeling or seeing a hard lump of muscle tissue under the skin.
The Mayo Clinic states that muscle cramps can occur because of sitting in the same position for a long period of time or dehydration.
Walking around, breaking up travel, and drinking lots of water can alleviate muscle cramping, while adjusting to the destination time zone before travel will help the body be more rested.
The CDC says symptoms of jet lag can last several days depending on the number of times zones and the direction traveled. People traveling east have more trouble adjusting than those traveling west.
The American Academy of Sleep Medicine says the number of jet lag symptoms increase with the increase in number of time zones traveled. Older adults may take longer to recover than younger adults.