the level of melatonin

hi guys, somebody wrote earlier in this forum about checking up the cortisol and melatonin level.my question is, is it possible to check the melatonin level?? I know you check your cortisol level but I dont know melatonin. I read about melatonin that it is related with our serotonin level and it is deep inside the brain. If you have low serotonin, you will have low melatonin and it is said to be that to boost your melatonin, you should get a SUN SHINE(UV) to increase your melatonin, but anyway, is it possible to check the level melatonin??? Tweet