Before you brand someone who suffers from excessive daytime sleepiness all the time as innately lazy, perhaps you need to brush up your medical knowledge. For excessive sleepiness during the day could have several connotations. In fact, it could be a precursor to a host of sleep disorders including sleep apnea, hypersomnia or even narcolepsy sleep disorder. Unfortunately, there are a couple of factors that usually misdirect the sufferer as well as those around him or her. First of all, it is linked to exhaustion, lack of good sleep during the night,etc. Secondly, this symptom is common to many kinds of sleep disorders, resulting in misdiagnosis or even wrong treatments.