寝る → 寝るようになる

  1. 寝ないようになる
  2. 寝なくようになる
  3. 寝なくなる

Hi guys, sorry if this has been asked before. I've learned in class that
`寝なくなる` is the valid form, but are the first two forms valid as well?
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2015-12-13T04:39:51.020
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2016-02-07T08:39:12.223
2016-02-07T08:39:12.223
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question
grammar verbs conjugations
Verb negative-form + なる