Hawzah News Agency – The merciful prophet of Islam (pbuh) says in his advice to Abu Dharr:

يا أبا ذرٍّ، لِيَكُن لَكَ في كُلِّ شَي‏ءٍ نِيَّةٌ صالِحَةٌ، حتّى‏ في النَّومِ والأكلِ .

'O Abu Dharr, you should have a righteous intention in everything you do, even in sleeping and eating.'

Source: Makarim al-Akhlaq, v. 2, p. 370, no. 2661