If you are 'totally rejuvenated' in this context it means that you had an incredibly good sleep and feel in great form to undertake the trials of the day ahead. It is exaggerated speech (hyperbole) which indicates you are also in an energetic and perhaps humorous mood.
"I slept great; now I am ready to take on the day!"
I slept great - you slept really well and feel good
Take on the day - You are ready to deal with the day and everything that you need to accomplish.
Other examples:
"I slept well and I feel well rested." (Rested - that you feel refreshed)
"I slept well an I am ready to start the day!" (Start the day - you are excited to begin your day)
例文
"I slept great; now I am ready to take on the day!"
（よく眠れた。今日も頑張るよ）
I slept great - よく眠れて、気分が良いということ。
Take on the day - その日、その日の仕事に取り組む準備ができているということ。
他の例文
"I slept well and I feel well rested."
（よく眠れて、気分が良いです）
※ Rested - 気分がリフレッシュした
"I slept well and I am ready to start the day!"
（よく眠れたから、今日も頑張る）
※ Start the day - 1日が始まることにワクワクしている
I got my 8 hours last night and know I feel awesome
"I slept like a baby and know I feel great!"
To 'sleep like a baby' is the expression for when one has had a very good nights sleep, to get enough hours and to wake up feeling refreshed, this is a widely used and causal expression for describing a good nights sleep.
To get your '8 hours' is a causal expression describing that you had got 8 hours of sleep last night, the reason of 8 hours is it is the recommended amount of hours you should sleep per night.
"I slept like a baby and know I feel great!"（ぐっすり眠れたので気分がいいです）
'sleep like a baby' は、十分な時間眠ることができて朝気持ちよく起きられたときに使います。すごく一般的でカジュアルな表現です。
'get your 8 hours' は「昨日の夜8時間眠れた」のカジュアルな言い方です。「8時間」である理由は、それが1日の推奨睡眠時間だからです。
I had a good sleep and woke up feeling great today
When you want to express that you slept well and you are feeling good; then you may say:
-I slept very well and feel great
-I had a good sleep and woke up feeling great today
「よく眠れてすごく気分がいい」は、次のように言えます。
-I slept very well and feel great（よく眠れてすごく気分がいいです）
-I had a good sleep and woke up feeling great today（よく眠れて今日はすごく目覚めが良かったです）
This morning I feel great, last night I slept very well.
I woke up feeling great this morning, what a refreshing sleep!
"I slept very well, today I feel great!"- This statement indicates that you had a peaceful nights rest and because of this you feel good.
"This morning I feel great, last night I slept very well."- This indicates you are feeling very good because of the good night rest you received the night before.
I woke up feeling great this morning, what a refreshing sleep!- This indicates that when you woke up this morning you felt good physically and mentally. You then explain it was because of a restful nights sleep. By saying 'a refreshing sleep' it means you feel like a new person, or have lots of energy for the day ahead.
"I slept very well, today I feel great!"（よく眠れました、今日は気分がいいです）
→ここでは、「よく眠れたので気分がいい」と伝えています。
"This morning I feel great, last night I slept very well."（今朝は気分がいいです、昨日の夜よく眠れました）
→これは「前の夜よく眠れたので気分がいい」と伝えています。
I woke up feeling great this morning, what a refreshing sleep!（今朝はすごく目覚めがよかったです、よく眠れました）
→これは、「今朝、目が覚めたとき心も体も調子がよかった」と伝えています。この後、その理由（よく眠れた）を説明しています。'a refreshing sleep' は、眠って元気が回復することを表します。
I slept really well and I'm feeling refreshed. How are you?
I slept like a log last night, I'm really energized and ready to take on the day!
Good night's rest' is another way of saying I slept well.
'Feeling refreshed' will follow from being well rested or sleeping well.
'I slept like a log' is an idiom that means a person slept without waking
up during the night.
'I'm ready to take on the day' because I feel energized after a good
night's sleep.
Good night's rest' は 'I slept well'（よく眠れました）の別の言い方です。
十分休んだり寝た後には 'Feeling refreshed'（すっきりする）になります。
'I slept like a log' は「熟睡した」という意味です。
'I'm ready to take on the day' because I feel energized after a good night's sleep.
（ぐっすり眠ることができたので、元気が出ました）
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