Must is related to Necessary. Sleep can be Necessary. Sleep is related to Shut. Shut is a synonym of Alley. 
Will is a type of Desire. Will is similar to Shall. 
Must <--RelatedTo--> Necessary <--HasProperty-- Sleep <--RelatedTo--> Shut <--Synonym--> Alley 
Desire <--IsA-- Will <--SimilarTo--> Shall 