The Mattel Drowsy doll, 14" tall, vinyl head and hands on earliest talking dolls, were made form 1964-1974.
Later hands were cloth, stuffed cloth body, pull cord talker, sleep eyes, and painted facial features, earliest dolls were dressed in a Kitty print sleeper with feet and rear drop seat, later ones in same sleeper design but now in pink with large white polka dots, both versions the box doubles as a cradle. The hands and face were made of vinyl.
Marked on a tag on the back. The Drowsy Doll was very popular and Mattel reproduced it in 1984 and 2000, these dolls are similar but with battery operated voicebox. Mattel also made black Drowsy Dolls.
She would say things like "Mommy, kiss me goodnight", "I'm sleepy", "I go sleep now, night-night", "I wanna stay up," and "I want a drink of water".
What's it worth? Take a look at this Drowsy price guide: sold listings for a value indication.