Patients frequently report having dreams during general anesthesia. The incidence of dreams during general anesthesia that have been reported by patients upon awakening has been reported to range from 10 to 36% [1] and to be higher in younger patients, female patients [2], and patients who received ketamine [3].
Conclusions: Dreaming during anesthesia is unrelated to the depth of anesthesia in almost all cases. Similarities with dreams of sleep suggest that anesthetic dreaming occurs during recovery, when patients are sedated or in a physiologic sleep state.
However, 17% ( n=49) of all patients indicated that they remembered the tracheal tube or being on the ventilator, before they woke up. Some patients (21.1%) reported dreams or dreamlike sensations. Some patients (9.3%) recalled nightmares, while 6.6% reported hallucinations.
While under general anesthesia, you are in a drug-induced unconsciousness, which is different than sleep. Therefore, you will not dream. However, if you are under a nerve block, epidural, spinal or local anesthetic, patients have reported having pleasant, dream-like experiences.
Younger, healthier patients and those who receive propofol for maintenance of anaesthesia are more likely to report dreaming. The dreams are usually pleasant, and the phenomenon appears to be harmless and not related to inadequate anaesthetic depth in most cases1.
But does that mean that propofol sedation is the same as sleep? Propofol sedation is nothing at all like sleep. Sleep is reversible with external stimulation - if you shake somebody, they wake up.
Although doctors often say that you'll be asleep during surgery, research has shown that going under anesthesia is nothing like sleep. “Even in the deepest stages of sleep, with prodding and poking we can wake you up,” says Brown.
Anesthesia Awareness (Waking Up) During Surgery
If you're having a major surgery, you most likely will receive general anesthesia and be unconscious during the procedure. This means you will have no awareness of the procedure once the anesthesia takes effect, and you won't remember it afterward.
Consciousness is in a dream-like state during anaesthesia
All in all, the findings indicate that consciousness is not necessarily fully lost during anaesthesia, even though the person is no longer reacting to their environment. However, dream-like experiences and thoughts might still float in consciousness.
What is particularly noteworthy about all of these areas of cutting-edge research on anesthesia, sleep, coma, and near death experiences is that they all point to the same conclusion: our souls — and specifically the mental powers of our souls — are not “turned off” by anesthesia, by sleep, or even by coma or death.
Nursing and other medical staff usually talk to sedated people and tell them what is happening as they may be able to hear even if they can't respond. Some people had only vague memories whilst under sedation. They'd heard voices but couldn't remember the conversations or the people involved.
Some scientists believe coma patients don't see or feel or hear a thing. Others say something different. Some scientists believe that coma patients actually dream.
Intubation is simply the process of placing the tube that protects the airway, keeping an open passageway to the lungs. While being awake on a ventilator is possible, people are usually sedated to help prevent anxiety or discomfort.
Anesthesia won't make you confess your deepest secrets
It's normal to feel relaxed while receiving anesthesia, but most people don't say anything unusual. Rest assured, even if you do say something you wouldn't normally say while you are under sedation, Dr. Meisinger says, “it's always kept within the operating room.
Sedation related sleep is induced by slowing down brain activity. The effects can often be experienced in the daytime as well as the night, which is why people who take them might feel lethargic and uncoordinated. Effects are not always severe, but people are likely to feel more drowsy and muddle-headed than usual.
Can patients hear us when they are very asleep? It is possible that patients can hear and feel what is going on around them, even when apparently unconscious, but they might be too sleepy to respond when we speak to them or hold their hand.
According to Brown, the less frequent spikes of neural activity during anesthesia are actually more coordinated than in any other mental state. Whether you're alert, reading, sleeping, or meditating, your brain waves are chaotic and tough to parse. But no signal is as clear and rhythmic on an EEG as anesthesia.
There is continuous monitoring of the electrical activity in your heart, the amount of oxygen in your blood, your pulse rate, and blood pressure. Sometimes a device is used to monitor your brain waves while 'asleep', giving the doctor more detailed information about your level of unconsciousness.
The process of waking up from anesthesia is known as emergence. During emergence, the anesthesiologist will slowly reduce the amount of anesthetic drugs in the body. This helps to reduce the intensity of the effects of anesthesia and allows the patient to regain consciousness.
The drugs used to sedate patients seem to play a role. “There is a medication called Sevoflurane, which is a gas that we use commonly to keep patients asleep there's some increased incidence of crying when that medication is used,” said Heitz.
Why Do People Cry After anesthesia? There is a medicine known as Sevoflurane. This medicine is a gas that is being commonly used in order to keep patients in sleep. This medicine is noted to be the reason why people cry after anesthesia.
Waking up from anesthesia can take anywhere from a few minutes to several hours, depending on the type of anesthesia used and the individual's response to it. Generally, most people wake up within 30 minutes of the anesthesia being administered.
True prolonged postoperative coma is relatively uncommon, with estimates ranging from 0.005 to 0.08 percent following general surgery, but with higher rates reported after cardiac surgery.
But, just as there are side effects and risks with any surgery, there may be side effects with general anesthesia. Most are minor, including nausea and vomiting, a feeling of disorientation, a sore throat (if you've had a breathing tube), itching, and chills. These effects should wear off within a few hours.