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My comment on Artem Kartsev's answer is more than his answer, so I'll take it out as an answer:
What is the relationship between consciousness (speech) and the ability to dream?
A dream is a sequence of images formed from sensations already experienced by the brain. These dreams are reported by people who are woken up during REM sleep.
The fetus (for those who will Google) experiences various sensations, so images are born (fixed in memory). The brain can play them back.
Rapid sleep is recorded in all mammals and birds. The fetus, too. Using an electroencephalogram. We see the same manifestation of the alleged phenomenon in an adult, in a fetus, in mammals. What are the grounds for saying that an adult has it and others don't? (Yes, strictly speaking, it is necessary to prove the statement, but scientists do not claim it, but then there will be proofs about the fact that dreams have long been confidently assumed not only in adults and not only in people. And in adults, the fact that those who are woken up in the fast phase tell stories is also not a strict proof. Strictly proven only special brain activity at this time, which is present in adults, fetuses, and mammals.)
That's the first thing.
And secondly, when does the fetus become conscious? Is this a switch that turns on after birth? Or, perhaps, it, after all, gradually arises?
Here is a proof about the study of REM sleep in animals and the opinion of scientists:
http://www.newsru.com/world/19dec2006/ratdream.html
Here is a proof about fetal brain electroencephalograms recording the rapid phase of sleep in the fetus in which an adult presumably dreams:
http://www.nevromed.ru/diagnostica/papers_eeg/p_eeg_sleep
Pubmed:
The function of fetal/neonatal rapid eye movement sleep.
Infant dreaming and fetal memory: a possible explanation of sudden infant death syndrome.
(this is generally very interesting – it suggests a connection between dreams as an experience of the past and the syndrome of sudden infant death)
No. Since the fetus has no consciousness. De Facto, it is not a person at all and does not possess the attributes inherent in a person, such as higher nervous activity.