Psafapour,Its very good question....
Whatever u read is right...
Depression characteristic u read is typical one and if its there then it called Major Depression where suicidal idea,sitting at home,worthless,hopeless feeling present.
But disturbed
sleep,restlessness,worry,
irritability,altered concentration,altered
appetite is sign of mild depression...if it present and disturbing ur routine then u have Depression...As u mentioned only abt. disturbed sleep I dont know of rest so 100 % I cant say yes or no... most of time early signs of depression is disturbed sleep...
If u in doubt pls have another expert opinion or u can ask same Dr. about it so he can explain u in detail...