to lie /lɑɪ/ /laɪ/
to lie down /laɪ daʊn/ /laɪ daʊn/
to sleep /sliːp/ /sliːp/
to slumber
go to bed /goʊ tu bɛd/ /gəʊ tuː bɛd/
go to sleep /goʊ tu slip/ /gəʊ tuː sliːp/