Hobi mutadil ba shakhs foida doshta khobi ziyod natanho zararovar, balki khatarnok meboshad. YAne purkhobi boisi farbehi va badan kasali megardad. Serkhobi khosi kudakon buda bo guzashti vaqg onro ba 7-8 soat boyad rasonid. Olimon isbot kardaand, ki shakhsi serkhob tez memirad. YAne khobi az had ziyod va khobi az 4 soat kam margovar meboshad. Muvofiqi malumoti olimoni amrikoi khudkushnho bepggar vaqt az sababi serkhobi va kamkhobi meshavand.
Hobi az had ziyod ba fikri K, D. Ushinskiy shakhsro latta, kamhis, sust, landahur va vazni uro ziyod mekunad. Binobar in idora karda tavonistani khob niz zarur meboshad.
Bekhobi va serkhobi alomati kasali buda yake az sababhoish khastagii ziyod meboshad. Baze kasalihoi asab metavonand boisi vayronshavii khobi mutadil gardand.
Va in metavonad boisi bo ovoz yo ki beovoz budani khobi dida gardad. SHakhsoni doroi norasoihoi asabi doshta beshtar dar khob gap mezanand, yane khobashon bo ovoz va harakat meboshad. SHakhsoni dar khobashon norohat buda odatan vaqti khob dandonhoyashonro ba hamdigar sakht-sakht rasonida ovozi bejo mebarorand.
Bekhobi yake az namudhoi azob yo ki dardi vaznin msboshad. Behuda nest, ki dar Hitoi qadim «bekhobi»-ro hamchun «azobi okhirin istifoda meburdand, yane shakhsi ba qatl hukm shudaro to farorasii margash az khob mahrum mekardand.
Az bekhobi pesh az hama maynai sar zarar mebinad, k.i dar natija khotira sust shuda tasavvurot past va quvvai kori kam meshavad.